What Vitamin B12 is graded against

2 conditions the Vitamin B12 entry grades it against, grouped by direction.

Improves1 link

Pernicious / macrocytic anemia
Standard treatment
Evidence grade A

No clear effect1 link

Cognitive decline
Corrects deficiency-linked decline only
Evidence grade C

Directions and grades are read from each intervention’s own entry in this library. They describe the evidence for a link, not what anyone should take, and they are no substitute for a clinician who knows the person.